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ClinicalTrials.gov public records Last synced Sep 7, 2026, 4:23 PM EDT

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Showing 1–15 of 15 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: Breathe sample Clear all
Active, not recruiting No phase listed Observational Accepts healthy volunteers

Impact of E-cigarette Use on the Body

NCT04972513
View directory record Official record
Conditions
Cigarette Smoking-Related Carcinoma
Interventions
Biospecimen Collection, Nitric Oxide Breath Test, Oscillometry, Spirometry, Survey Administration, Endothelial function
Procedure · Other
Lead sponsor
Ohio State University Comprehensive Cancer Center
Other
Eligibility
15 Years to 25 Years
Enrollment
182 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2026
U.S. locations
1
States / cities
Columbus, Ohio
Source: ClinicalTrials.gov public record
Updated Mar 22, 2026 · Synced Sep 7, 2026, 4:23 PM EDT
Terminated Phase 2 Interventional Accepts healthy volunteers

Cerebrovascular Reactivity Assessed With fNIRS as a Biomarker of TCVI After Acute Traumatic Brain Injury in Military

NCT04058132
View directory record Official record
Conditions
Traumatic Brain Injury
Interventions
Sildenafil Citrate 50Mg Tab, functional Near-infrared Spectroscopy (fNIRS), Carbon Dioxide (CO2) 5%, Neuropsychological Assessments, Gadolinium contrast infusion, Blood sample collection for research purposes, Structural brain Magnetic Resonance Imaging (MRI
Drug · Device · Other + 1 more
Lead sponsor
Uniformed Services University of the Health Sciences
Federal
Eligibility
18 Years to 55 Years
Enrollment
1 participant
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2020
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Feb 27, 2024 · Synced Sep 7, 2026, 4:23 PM EDT
Terminated No phase listed Observational

Analysis of Volatile Organic Compounds in the Breath of Lung Transplant Rejection Patients Using Infrared Spectroscopy

NCT06309628
View directory record Official record
Conditions
Lung Transplant Rejection
Interventions
Breathe sample
Diagnostic Test
Lead sponsor
Paragonix Technologies
Industry
Eligibility
18 Years and older
Enrollment
35 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2025
U.S. locations
1
States / cities
Durham, North Carolina
Source: ClinicalTrials.gov public record
Updated May 30, 2025 · Synced Sep 7, 2026, 4:23 PM EDT
Completed Early Phase 1 Interventional Accepts healthy volunteers

Heart Rate Variability Biofeedback in Older Adults

NCT05902286
View directory record Official record
Conditions
Older Adult
Interventions
OSC-
Behavioral
Lead sponsor
Brigham Young University
Other
Eligibility
65 Years and older
Enrollment
59 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2024
U.S. locations
1
States / cities
Provo, Utah
Source: ClinicalTrials.gov public record
Updated Aug 11, 2024 · Synced Sep 7, 2026, 4:23 PM EDT
Terminated No phase listed Observational Accepts healthy volunteers

Shifts in the Respiratory Microbiome and Clinical Outcomes of SARS-CoV-2

NCT04815018
View directory record Official record
Conditions
SARS-CoV-2 Infection, Bacterial Respiratory Tract Infection, Viral Respiratory Tract Infection
Interventions
Not listed
Lead sponsor
Pathnostics
Industry
Eligibility
60 Years and older
Enrollment
185 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2021
U.S. locations
4
States / cities
Delaware, Ohio • Granville, Ohio • Westerville, Ohio
Source: ClinicalTrials.gov public record
Updated Jun 29, 2021 · Synced Sep 7, 2026, 4:23 PM EDT
Active, not recruiting No phase listed Observational Accepts healthy volunteers

Electrical Stimulation of Human Myocytes in Microgravity

NCT03665051
View directory record Official record
Conditions
Sarcopenia
Interventions
Muscle Tissue Biopsy, Maximal Oxygen Consumption (V02max)
Procedure · Other
Lead sponsor
AdventHealth Translational Research Institute
Other
Eligibility
20 Years to 80 Years
Enrollment
75 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2025
U.S. locations
1
States / cities
Orlando, Florida
Source: ClinicalTrials.gov public record
Updated Jun 10, 2025 · Synced Sep 7, 2026, 4:23 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Mental Health Intervention Research in At-Risk Adolescents

NCT05760443
View directory record Official record
Conditions
Mental Health Wellness 1
Interventions
Learning to BREATHE
Behavioral
Lead sponsor
Colorado State University
Other
Eligibility
12 Years to 18 Years
Enrollment
74 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2025
U.S. locations
1
States / cities
Fort Collins, Colorado
Source: ClinicalTrials.gov public record
Updated May 17, 2025 · Synced Sep 7, 2026, 4:23 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

Defining a PD-specific Breath Fingerprint of Underlying Inflammatory and Neurodegenerative Processes

NCT02749214
View directory record Official record
Conditions
Parkinson's Disease
Interventions
Blood Sample Collection, Breath Sample Collection
Other
Lead sponsor
Emory University
Other
Eligibility
25 Years to 85 Years
Enrollment
100 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2019
U.S. locations
1
States / cities
Atlanta, Georgia
Source: ClinicalTrials.gov public record
Updated Jun 17, 2019 · Synced Sep 7, 2026, 4:23 PM EDT
Terminated No phase listed Observational

Breath Metabolomics in the Laboring Parturient

NCT04564196
View directory record Official record
Conditions
Labor Onset and Length Abnormalities
Interventions
Breath Sample
Procedure
Lead sponsor
Stanford University
Other
Eligibility
18 Years and older · Female only
Enrollment
53 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2023
U.S. locations
1
States / cities
Stanford, California
Source: ClinicalTrials.gov public record
Updated Jun 7, 2023 · Synced Sep 7, 2026, 4:23 PM EDT
Recruiting No phase listed Observational Accepts healthy volunteers

Lung Macrophage Populations and Functions in Chronic Obstructive Pulmonary Disease (COPD)-Susceptible Smokers

NCT04722835
View directory record Official record
Conditions
Copd, Smoking, Tobacco Use
Interventions
Bronchoscopy with Bronchoalveolar Lavage (BAL)
Procedure
Lead sponsor
University of California, San Francisco
Other
Eligibility
40 Years to 75 Years
Enrollment
40 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2030
U.S. locations
3
States / cities
San Francisco, California
Source: ClinicalTrials.gov public record
Updated Jun 3, 2026 · Synced Sep 7, 2026, 4:23 PM EDT
Terminated Phase 4 Interventional Accepts healthy volunteers Results available

Polycystic Ovary Syndrome (PCOS) and Sleep Apnea

NCT00203996
View directory record Official record
Conditions
Polycystic Ovary Syndrome, Obstructive Sleep Apnea
Interventions
continuous positive airway pressure (CPAP), depot leuprolide plus estrogen/progestin replacement, pioglitazone, REM frag, SWS supp
Device · Drug · Procedure
Lead sponsor
University of Chicago
Other
Eligibility
18 Years to 40 Years
Enrollment
37 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2003 – 2008
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Mar 20, 2023 · Synced Sep 7, 2026, 4:23 PM EDT
Terminated No phase listed Observational Accepts healthy volunteers

Cue Reactivity in Virtual Reality: The Role of Context

NCT00862927
View directory record Official record
Conditions
Smoking
Interventions
Breath Sample, Saliva Sample, Questionnaire, View Virtual Reality Scenes
Other · Behavioral
Lead sponsor
M.D. Anderson Cancer Center
Other
Eligibility
18 Years and older
Enrollment
21 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2009 – 2011
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Jun 19, 2012 · Synced Sep 7, 2026, 4:23 PM EDT
Terminated Not applicable Interventional Results available

Exhaled Breath Analysis to Predict Risk of Symptomatic Pneumonitis

NCT04040244
View directory record Official record
Conditions
Pneumonitis, Nonsmall Cell Lung Cancer Stage III
Interventions
Exhaled Breath Collection, Blood sample
Other
Lead sponsor
Wake Forest University Health Sciences
Other
Eligibility
18 Years and older
Enrollment
16 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2022
U.S. locations
1
States / cities
Winston-Salem, North Carolina
Source: ClinicalTrials.gov public record
Updated Oct 10, 2023 · Synced Sep 7, 2026, 4:23 PM EDT
Recruiting No phase listed Observational

The APS Phenotyping Study

NCT06521502
View directory record Official record
Conditions
ARDS, Sepsis, Pneumonia
Interventions
Blood collection, Urine Collection, Nasal, oral, and rectal swabs, Stool collection, Heat Moisture Exchange Filter collection, Tracheal Aspirate sample collection, Non-bronchoscopic bronchoalveolar lavage (NBBAL), Surveys, Short physical performance battery, Hand grip strength, CNS Vital Signs, Muscle Ultrasound, Muscle Strength, Spirometry, Lung Diffusion Testing (DLCO), Chest CT Scan
Other · Procedure · Radiation
Lead sponsor
Vanderbilt University Medical Center
Other
Eligibility
18 Years and older
Enrollment
4,000 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2029
U.S. locations
20
States / cities
Fresno, California • Palo Alto, California • San Francisco, California + 12 more
Source: ClinicalTrials.gov public record
Updated Feb 19, 2026 · Synced Sep 7, 2026, 4:23 PM EDT
Active, not recruiting Not applicable Interventional Accepts healthy volunteers

Strategies to Augment Ketosis: Optimization of Ketone Delivery Strategies

NCT05501366
View directory record Official record
Conditions
Ketosis
Interventions
Ketone Supplement, Beverage Tolerability Questionnaire (BTQ) and satiety visual analogue scale, Blood Draw, Breath Reading, Heart Rate Variability, CGM/CKM, DXA, Urine Analysis
Dietary Supplement · Behavioral · Biological + 2 more
Lead sponsor
Ohio State University
Other
Eligibility
20 Years to 30 Years · Male only
Enrollment
14 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2027
U.S. locations
1
States / cities
Columbus, Ohio
Source: ClinicalTrials.gov public record
Updated May 28, 2026 · Synced Sep 7, 2026, 4:23 PM EDT